uniq — report or omit repeated lines
uniq [OPTION...] [ INPUT [OUTPUT] ]
Discard all but one of successive identical lines from INPUT (or standard input), writing to OUTPUT (or standard output).
Mandatory arguments to long options are mandatory for short options too.
−c, −−countprefix lines by the number of occurrences
−d, −−repeatedonly print duplicate lines
−D, −−all−repeated[=delimit−method]print all duplicate lines delimit−method={none(default),prepend,separate} Delimiting is done with blank lines.
−f, −−skip−fields=Navoid comparing the first N fields
−i, −−ignore−caseignore differences in case when comparing
−s, −−skip−chars=Navoid comparing the first N characters
−u, −−uniqueonly print unique lines
−z, −−zero−terminatedend lines with 0 byte, not newline
−w, −−check−chars=Ncompare no more than N characters in lines
−−helpdisplay this help and exit
−−versionoutput version information and exit
A field is a run of whitespace, then non−whitespace characters. Fields are skipped before chars.
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Note |
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'uniq' does not detect repeated lines unless they
are adjacent. You may want to sort the input first,
or use `sort |
The full documentation for uniq is maintained as a Texinfo manual. If the info and uniq programs are properly installed at your site, the command
info uniq
should give you access to the complete manual.
| COPYRIGHT |
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Copyright © 2008 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. |